68/70 as a percentage is 97.14%. This shows that the fraction is almost a whole, just a little short of 100%.
The fraction 68/70 can be reduced to 34/35, which is still a very large part of a whole. When you think of it in everyday terms, it means you have 34 out of 35 equal pieces.
Because the percentage is so high, you’ll see numbers like this in quality scores, test results, or success rates. It tells people quickly that something is performing very well, just a tiny bit below perfect.